[f-nsp] Best practise for dual-stack IPv6 on Jetcore-based devices

[Chris Hellkvist]

Hi,

we have some boxes (mostly BI 4k/8k) on running Jetcore modules and SW
B2P08001w. Currently a typical config towards a network looks like
this:
vlan 436 name DFUE-FIELDSR1-NW/#28311146/RED-0 by port
 untagged ethe 8/20 to 8/24
 ip-subnet 10.238.20.0 255.255.255.0 name DE-B73_HEAD/#42574412/RED-0
  static ethe 8/20
 router-interface ve 20
 ip-subnet 10.238.21.0 255.255.255.0 name DE-GAB_HEAD/#53636326/RED-0
  static ethe 8/21
 router-interface ve 21
 ip-subnet 10.238.22.0 255.255.255.0 name DE-UBR_SUB/#61252273/RED-0
  static ethe 8/22
 router-interface ve 22
 ip-subnet 10.238.23.0 255.255.255.0 name DE-DIZ_SUB/#38524742/RED-0
  static ethe 8/23
 router-interface ve 23
 ip-subnet 10.238.24.0 255.255.255.0 name DE-BZH_SUB/#26827471/RED-0
  static ethe 8/24
 router-interface ve 24

So, my first attempt was to create a ipv6-subnet in the VLAN:
SSH at GF(config-vlan-436)#ipv6-proto name Testbed_V6
error - failed to create IPv6 protocol vlan because IP subnet vlan was
configured

Okay, so i tried the hard way by putting a v6 address on the existing
VE interface:
SSH at CR-X-GDF-5(config-vif-23)#ipv6 enable
SSH at CR-X-GDF-5(config-vif-23)#ipv6 address fc55:cafe:cafe:cafe::1/64

But nope, no luck:
SSH at CR-X-GDF-5#sh ipv6 interface ve 27
Interface VE 23  is down, line protocol is down
  vlan id: 0, vlan index: 0, ve type: 0
  members: none
  active: none
  IPv6 is enabled, link-local address is
  Global unicast address(es):
  Joined group address(es):

Any ideas/hints how to configure dual-stack IPv6 on those boxes? The
Foundry documentation was not that helpful…

Thanks,
Chris